Ответ:
аn= a1+(n-1)d
d=12-2=10; a1=2; an=2+(n-1)•10=2+10n-10=10n-8
an=10n-8; a3=10•3-8=30-8=22
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Ответ:
аn= a1+(n-1)d
d=12-2=10; a1=2; an=2+(n-1)•10=2+10n-10=10n-8
an=10n-8; a3=10•3-8=30-8=22